This is the part of Volume that is new at P6: you are given the volume and asked for an edge. The method is always the same — divide the volume by everything you already know. Given two edges, multiply them first and divide by that product. Given the **base area**, divide by it straight away, because the base area already stands for `length × width` and you never need the two edges separately. A cube is the special case: with only one number to find, you look for the edge that gives the volume when it is multiplied by itself three times, and you find it by trying — there is no cube-root key on a PSLE paper.
Worked example
Problem A cuboid has a volume of 480 cm³. Its length is 12 cm and its width is 8 cm. Find its height. A cube has a volume of 512 cm³ — find one of its edges.